/**
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx.workgroup.packet;

import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.provider.IQProvider;
import org.xmlpull.v1.XmlPullParser;

import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Packet used for requesting information about occupants of a room or for
 * retrieving information such information.
 * 
 * @author Gaston Dombiak
 */
public class OccupantsInfo extends IQ {

	private static final SimpleDateFormat UTC_FORMAT = new SimpleDateFormat(
			"yyyyMMdd'T'HH:mm:ss");

	static {
		UTC_FORMAT.setTimeZone(TimeZone.getTimeZone("GMT+0"));
	}

	/**
	 * Element name of the packet extension.
	 */
	public static final String ELEMENT_NAME = "occupants-info";

	/**
	 * Namespace of the packet extension.
	 */
	public static final String NAMESPACE = "http://jivesoftware.com/protocol/workgroup";

	private String roomID;
	private final Set<OccupantInfo> occupants;

	public OccupantsInfo(String roomID) {
		this.roomID = roomID;
		this.occupants = new HashSet<OccupantInfo>();
	}

	public String getRoomID() {
		return roomID;
	}

	public int getOccupantsCount() {
		return occupants.size();
	}

	public Set<OccupantInfo> getOccupants() {
		return Collections.unmodifiableSet(occupants);
	}

	public String getChildElementXML() {
		StringBuilder buf = new StringBuilder();
		buf.append("<").append(ELEMENT_NAME).append(" xmlns=\"")
				.append(NAMESPACE);
		buf.append("\" roomID=\"").append(roomID).append("\">");
		synchronized (occupants) {
			for (OccupantInfo occupant : occupants) {
				buf.append("<occupant>");
				// Add the occupant jid
				buf.append("<jid>");
				buf.append(occupant.getJID());
				buf.append("</jid>");
				// Add the occupant nickname
				buf.append("<name>");
				buf.append(occupant.getNickname());
				buf.append("</name>");
				// Add the date when the occupant joined the room
				buf.append("<joined>");
				buf.append(UTC_FORMAT.format(occupant.getJoined()));
				buf.append("</joined>");
				buf.append("</occupant>");
			}
		}
		buf.append("</").append(ELEMENT_NAME).append("> ");
		return buf.toString();
	}

	public static class OccupantInfo {

		private String jid;
		private String nickname;
		private Date joined;

		public OccupantInfo(String jid, String nickname, Date joined) {
			this.jid = jid;
			this.nickname = nickname;
			this.joined = joined;
		}

		public String getJID() {
			return jid;
		}

		public String getNickname() {
			return nickname;
		}

		public Date getJoined() {
			return joined;
		}
	}

	/**
	 * Packet extension provider for AgentStatusRequest packets.
	 */
	public static class Provider implements IQProvider {

		public IQ parseIQ(XmlPullParser parser) throws Exception {
			if (parser.getEventType() != XmlPullParser.START_TAG) {
				throw new IllegalStateException(
						"Parser not in proper position, or bad XML.");
			}
			OccupantsInfo occupantsInfo = new OccupantsInfo(
					parser.getAttributeValue("", "roomID"));

			boolean done = false;
			while (!done) {
				int eventType = parser.next();
				if ((eventType == XmlPullParser.START_TAG)
						&& ("occupant".equals(parser.getName()))) {
					occupantsInfo.occupants.add(parseOccupantInfo(parser));
				} else if (eventType == XmlPullParser.END_TAG
						&& ELEMENT_NAME.equals(parser.getName())) {
					done = true;
				}
			}
			return occupantsInfo;
		}

		private OccupantInfo parseOccupantInfo(XmlPullParser parser)
				throws Exception {

			boolean done = false;
			String jid = null;
			String nickname = null;
			Date joined = null;
			while (!done) {
				int eventType = parser.next();
				if ((eventType == XmlPullParser.START_TAG)
						&& ("jid".equals(parser.getName()))) {
					jid = parser.nextText();
				} else if ((eventType == XmlPullParser.START_TAG)
						&& ("nickname".equals(parser.getName()))) {
					nickname = parser.nextText();
				} else if ((eventType == XmlPullParser.START_TAG)
						&& ("joined".equals(parser.getName()))) {
					joined = UTC_FORMAT.parse(parser.nextText());
				} else if (eventType == XmlPullParser.END_TAG
						&& "occupant".equals(parser.getName())) {
					done = true;
				}
			}
			return new OccupantInfo(jid, nickname, joined);
		}
	}
}
